Edward warwick



' UNITED STATES PATENT OFFICE.' i

EDWARD WARIVICK, OF BIRMINGHAM, ENGLAND. l

METHOD OF MAKING HOLLOW WHEEL-RIMS.

SPECIFICATION forming part of Letters Patent No. 506,753, dated October 17, 1893. Application ledOctoher 4, 1892. Serial No.447l809. (No model.) A

To aZZ whom it may concern:

Be it known that I, EDWARD WARWICK, a subject of the Queen of England, residing at Aston, Birmingham, in the county of Warwick, England, have invented certain new and useful Improvements in Methods of Making Hollow Wheel-Rims, of which the following is a specification.

The principal object of my invention is to provide an expeditious, economical and efcient method of making a hollow or cushion wheel-rim adapted for use in connection with bicycles, tricyeles and other vehicles.

My invention consists in the improvements hereinafter fully described and claimed.

The nature, objects and characteristic features of my invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof, and in which.

Figures l, 2, 3 and 4, are sectional views representing successive steps in my improved method of making the blank that forms the tread or tire of the rim. Fig. 5, is a similar View representing another step in the formation of the tread or tire blank and also showing the felly or upper blank of the rim. Fig. 6, is a plan view of the under side of Fig. 5. Figs. 7, 8 and 9, are sectional Views representig successive steps in my improved method of making the blank that forms the folly or upper portion of the rim; and Fig. 10, is a sectional view of a finished rim embodying features of my invention, and showing the edges of the two blanks compressed or consolidated together. v A wheel rim constructed in accordance with my invention comprises a concave tread or tire portion e, Fig. 5, provided with marginal seats d, and a narrower felly or upper portion k, provided with marginal flanges h, adapted to said seats, the construction being such that the concavity of the tread or tire portion e, exceeds the concavity of the felly or upper portion la, so that a space is afforded between the two in order to permit the tread or tire portion e, to yield and spring. An inspection of Figs. 5 and 10, will show that undue iiattening of the component portions of the 5o rim is resisted by the iianges h, which engage the seats d, in the same manner as a hook of steel of any required length are turned down as at a, in Fig. l, by passing the blank through suitable rolls or dies. The edges ct, of the blank, are then folded over upon themselves, as shown at b, in Fig. 2, by passing the blank through another set of rolls or dies. The folded edges b, of the blank, are then turned upward as shown at c, in Fig. 3, by passing the blank through suitable rolls or dies. The turned up edges b, of the blank are then folded back upon themselves, as shown in Fig. '4, by passing the blank through suitable rolls or'dies to form the seats d. The blank provided with the seats d, as shown in Fig. 4, is then passed through suitable rolls in order to render it concave as shown at e, in Fig. 5, whereby the tread or tire portion is completed.

In forming the upper or felly portion of the wheel rim I proceed as followsz--The margins or edges of a blank comprising a sheet of steel of the required -length and somewhat narrower than the sheet employed in the production of the tread or tire blank, are turned down as shown at f, in Fig. 7, by passing the blank through suitable rolls. The turned down edges f, of the blank, are then partially folded upon themselves as shown at g, in Fig. 8. The partially folded edges f, are then completely folded, as shown in Fig. 9, to form the flanges h, by passing the blank through suitable rolls. The blank provided with the flanges h, as shown in Fig. 9, is then passed through suitable rolls in order to render it concave, as shown at 7c, in Fig. 5. The iianges h, are then tted to their complemental seats d, as shown in Fig. 5, and the loosely united wheel rim is passed through suitable rolls or dies adapted to compress or. consolidate the fianges and their complemental seats, as shown at n and m, in Fig. 10, thus forming a ICO rigid hollow wheel rim especially adapted for use in connection with bicycles, tricycles and other Vehicles. rim are further secured together at m and n, by soldering or by brazing them.

Having thus described the nature and objects of my invention, what I claim as new, and desire to secure by LettersPatent, is-

The herein described Inode of making a hollow wheel rim, which consists first, in making a concave tread or tire provided with marginal seats by turning down, folding over and bending the edges of a blank to form said seats and then oft-setting the center portion of said blank, second, in making a felly of similar and less concavity and provided with The two portions of the wheel.

ALFRED WILLIAM TURNER, IsAAo MARKS. 

